With just four weeks until the final, the 36-year-old prison officer is said to be taking 35% of viewers' votes each week - more than double that of her nearest rival, 16-year-old Scot, Nicholas MacDonald.
A source told The Sun: “It’ll take a miracle for anyone else to win.
“Sam Bailey is so far ahead it is unreal. She’s the runaway leader, a million miles in front of her nearest rival and, if it was the final this weekend, she would romp home.
“Viewers love her voice and have really taken to her back-story. She is a mum who has worked in a tough job and people seem to relate to that.”
According to The Sun, the current standing of the contestants based on viewers votes is:
- Sam Bailey
- Nicholas MacDonald
- Sam Callahan
- Rough Copy
- Luke Friend
- Tamera Foster
- Hannah Barrett
An X Factor spokesman said: “There is always speculation about who’s where in the public vote, but we never comment until the series ends.”
Yesterday we reported how Simon Cowell has signed a new £150m deal with ITV to keep 'The X Factor' and 'Britain's Got Talent' on the channel until 2016.
The deal is also the clearest indication yet that the music mogul will return to the 'X Factor' judging panel next year in a bid to revive the show's flagging viewing figures.
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